<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>09 加函数前置与后置</title>
</head>
<body>
<script>
  var num1 = 1;
  var num2 = 1;
  console.log(++num1 + "num1" + num1);
  console.log(++num2 + "num2" + num2);
</script>
</body>
</html>